1. Detector Utility/Service Cavern
2017/9/28
Yasuhiro Sugimoto

2. Introduction

3. Alternative IR design by Tohoku team
Alternative IR design was presented at SLAC LC workshop

4. Alternative IR design by Tohoku team
In reality, not rectangular area

5. Alternative IR design by Tohoku team
In reality, not rectangular area

6. Alternative IR design by Tohoku team
TDR modified (two vertical shafts)
Proposed design of Utility cavern
Utility hall
Floor Area
50m x 20m = 1000 m2
volume
50m x 20m x 10m
=10,000m3
Tunnel volume
53m2 x 200m
=10,600 m3
TDR modified
Utility hall
Floor Area
25m x 25m x 5floors = 3125 m2
hall volume
25m x 25m x 43m
=26,875m3
Bypass Tunnel volume
13m2 x 200m
=2,600 m3
Required Utilities footprint
Device Footprint = 1305 m2
Elevator footprint x 5 floors
= 780 m2
Carry-in space = 296 m2
connection tunnel
between Utility and DR
Bypass tunnels
between Utility and
ML, DH, BDS, dumps
Utility-IP distance
６６．５ｍ
(vibration issue)
Utility-IP distance
109ｍ
(vibration issue)
Q: How simple is Energy flow?
what is the effect of mechanical vibration to IP?

7. Alternative IR design by Tohoku team
5th Floor
3rd Floor
4th Floor
1st Floor
2nd Floor

8. Alternative IR design by Tohoku team
In this design, DH is extended, and the extended part is used for utilities for accelerator
Original utility cavern is removed
No consideration for detector services/utilities
Many other concerns
Level of the 5th floor is higher than crane rail
Vibration
Noise
Effect of stray B field when a detector magnet is ON in the garage position
Radiation safety
Fire safety
Legitimacy with “Building Standards Law”
Confusion during construction/operation
Utilities for Acc., ILD, and SiD at the same place???

9. Detector Services/Utilities
I cannot accept the alternative design because there is no consideration on detector services/utilities, and not enough space for them
Then, how much space do you need?
……. I don’t know exact number
We have to clarify requirements for underground services/utilities for detectors

10. Service caverns for lhc Detectors

11. ATLAS USA15 Another small service cavern US15
Size: 20mx62m = 1240 m2 (height=13.5m)
2~3 floors
Separated from UX15 by 2m thick wall
Another small service cavern US15
~100 electronics racks are placed in the detector hall

12. CMS USC55 Size: 18mx85m = 1530 m2 Two floors
~1/3 is used for electronics racks
Bypass tunnel for accelerator

13. CMS

14. CMS

15. Service/Utility requirements for ilc detectors

16. Requirement survey
Requirements for the ILC Detector Hall have been summarized as an excel file by MDI community
However, space requirement is not listed there

17. Services/utilities to be considered
Detector services
Electronics racks (Back-end electronics, low voltage PS, etc.)
Sub-detector cooling plants
Laser system for calibration
Chamber gas (including control system)
Cryogenics for solenoid/QD0
Utilities
Electricity
Cooling water (normal/chilled water)
HVAC (Heating, ventilation, and air conditioning)
He gas
Compressed air for air pad/other controls
Others
Workshop
Sanitary

18. Electronics racks So-called 19-inch racks
Used for back-end electronics, low voltage power supply, controllers for services, computer farm, etc.
CMS uses ~250 racks with 1.6MW power consumption
ILD
One rack would occupy 1.2x3 m2 footprint including space for cables, cooling, and operation
~60 racks can be put on the 2~5F of utility gallery
If we assume 120 racks (1/2 of CMS) is necessary, 60 racks have to be placed in service cavern
Each rack would be cooled by a fan-coil unit using chilled water as coolant
How many racks do we need in total?
Electronics racks

19. Utility gallery Utility gallery for each detector in DH
1F: to be used as loading area
2F: 142 m2
3F-5F: 570 m2
6F: 386 m2 (for cryogenics)
Space for passage for people/apparatus should be secured

20. Sub-detector cooling plants
Sub-detector cooling plants require quite large space
Some of them (ECAL cooling system) have to be put on 1F or below
Cooling water (normal or chilled) is necessary for the cooling plant (secondary loop)
Belle-II VTX cooling plant (2-phase CO2)

21. Sub-detector cooling plants
ATLAS IBL (Si detector) cooling system (2-phase CO2) in the service cavern

22. Laser system
Laser system will be used for tracker alignment and calorimeter calibration
Laser light source requires isolated space

23. Chamber gas Chamber gas is necessary for TPC and SDHCAL
Gas storage on surface like CMS?
CMS RPC gas system

24. Cryogenics He compressor on surface
Pressurized He through main shaft or utility shaft?
Cold box is attached to detector (platform)
DC power supply on 6th floor of Utility Gallery
Dump resister on 6th floor of Utility Gallery?
Cold box for QF1 on 6th floor of Utility Gallery(?)

25. Electricity 275kV66kV trans and 66kV6kV trans. on surface
6kV400/200/100V trans. in Utility/Service cavern (restricted area)

26. Cooling water Normal water Chilled water
Magnet (Solenoid, QD0, QF1) power supply
Dump resister (after quench)
Precision chillers for sub-detector cooling systems
~800kW~1m3/min if DT=10℃
Chilled water
Electronics racks through fan-coil units
Sub-detector cooling system
~700kW~2m3/min if DT=5℃
High pressure due to Dh~100 m should be isolated from underground apparatus using heat exchanger (2-loop system)

27. Chilled water
~20m
~100m

28. HVAC Air handling units on surface (next to assembly hall)
Air ducts through main shaft

29. HVAC - CMS

30. Garage for air handling units
HVAC – Assembly Hall
Garage for air handling units

31. Compressed air ~5MPa compressed air is necessary for air-pads
~1MPa compressed air might be necessary for control and tools
Compressor on surface
Buffer tank in service cavern?

32. Space requirement for service/utility cavern
Preliminary guess (ILD only)
Width (m)
Depth (m)
Number
Area (m2)
Heat exchanger 1 3 6 18
Water pump
Transformer 4 24
Air buffer tank 2
Sub-det cooling system 5 10
150
Laser system 9
Electronics racks
1.2 60
216
Duct/cable tray 25 WC 30
Workshop
Total
538

33. Space requirement for service/utility cavern
More than 1000m2 space might be necessary for utility/service caverns for ILD and SiD
Alternative design by Tohoku team does not have enough space for detector utilities and services
It is much more preferable to build utility/service caverns for accelerator, ILD, and SiD separately

34. Counter proposal

35. Counter proposal Separated utility caverns
Utility shaft and acc. utility cavern on the other side of damping ring tunnel
Small connection tunnels
Between utility cavern and detector hall
Between beam tunnel and DH alcoves

36. Small connection tunnels

37. Pros and cons Merits Demerits
Larger space for detector services/utilities
Vibration source is far from IP
Each utility/service caverns and elevator hall can be separated by firewalls
Less confusion in designing, construction, and operation
Demerits
Elevator is far from DH (You have to walk longer)

38. Energy Flow
Tohoku design
For accelerator only

39. Energy Flow
Counter proposal
For accelerator
RTML
RTML
For detector

40. Summary
Alternative design of Utility Hall was proposed by Tohoku team, but detector service/utility was not considered in that design
Motivated by that design, study on the requirement for utilities for detectors has been started
A possible counter proposal of the utility caverns has been presented
Anyway, each sub-detector group should think about necessary services and utilities
Number of electronics racks
Space and cooling water for sub-detector cooling system
Total AC power (voltage and current)
Chamber gas system
LASER alignment/calibration system
etc.

41. Backup slides

42. Utility gallery

43. Utility gallery

44. Utility gallery

45. Utility gallery